cmd/link: establish dependable package initialization order

As described here:

https://github.com/golang/go/issues/31636#issuecomment-493271830

"Find the lexically earliest package that is not initialized yet,
but has had all its dependencies initialized, initialize that package,
 and repeat."

Simplify the runtime a bit, by just computing the ordering required
in the linker and giving a list to the runtime.

Update #31636
Fixes #57411

RELNOTE=yes

Change-Id: I1e4d3878ebe6e8953527aedb730824971d722cac
Reviewed-on: https://go-review.googlesource.com/c/go/+/462035
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/src/runtime/plugin.go b/src/runtime/plugin.go
index a61dcc3b5d..312802de00 100644
--- a/src/runtime/plugin.go
+++ b/src/runtime/plugin.go
@@ -7,7 +7,7 @@ package runtime
 import "unsafe"
 
 //go:linkname plugin_lastmoduleinit plugin.lastmoduleinit
-func plugin_lastmoduleinit() (path string, syms map[string]any, errstr string) {
+func plugin_lastmoduleinit() (path string, syms map[string]any, initTasks []*initTask, errstr string) {
 	var md *moduledata
 	for pmd := firstmoduledata.next; pmd != nil; pmd = pmd.next {
 		if pmd.bad {
@@ -23,13 +23,13 @@ func plugin_lastmoduleinit() (path string, syms map[string]any, errstr string) {
 		throw("runtime: plugin has empty pluginpath")
 	}
 	if md.typemap != nil {
-		return "", nil, "plugin already loaded"
+		return "", nil, nil, "plugin already loaded"
 	}
 
 	for _, pmd := range activeModules() {
 		if pmd.pluginpath == md.pluginpath {
 			md.bad = true
-			return "", nil, "plugin already loaded"
+			return "", nil, nil, "plugin already loaded"
 		}
 
 		if inRange(pmd.text, pmd.etext, md.text, md.etext) ||
@@ -51,7 +51,7 @@ func plugin_lastmoduleinit() (path string, syms map[string]any, errstr string) {
 	for _, pkghash := range md.pkghashes {
 		if pkghash.linktimehash != *pkghash.runtimehash {
 			md.bad = true
-			return "", nil, "plugin was built with a different version of package " + pkghash.modulename
+			return "", nil, nil, "plugin was built with a different version of package " + pkghash.modulename
 		}
 	}
 
@@ -90,7 +90,7 @@ func plugin_lastmoduleinit() (path string, syms map[string]any, errstr string) {
 		}
 		syms[name] = val
 	}
-	return md.pluginpath, syms, ""
+	return md.pluginpath, syms, md.inittasks, ""
 }
 
 func pluginftabverify(md *moduledata) {